任何关键字都可以跳过DB2触发器中的当前行

Question

如果不存在，我必须写一个触发器将数据插入数据库。        我写了直到插入记录。如果数据存在，我正在发出信号        我的整批记录都失败了。

   My questions: Is there any keyword which will skip/ignore/discard the current row? 
   My trigger is below. I want to remove signal and keep something else which will 
   discard/ignore/skip the current row insertion. For example : Continue keyword in JAVA  .

   CREATE OR REPLACE TRIGGER tri_books_edit 
   NO CASCADE BEFORE INSERT ON books 
   REFERENCING NEW AS N
   FOR EACH ROW 
   WHEN ((select count(*) from books where book_name = N.book_name and author = N.Author) > 0)
   SIGNAL SQLSTATE '75000' SET MESSAGE_TEXT = 'Duplicate row with same name and author' 

   Thanks for your help

Answer 1

您无需为此使用触发器。只需在两个字段中添加唯一索引：

create unique index books_name_author on books(book_name, author);

防止重复的更简单的解决方案。